This is a zip. This is a png

!! UNFORTUNATELY, sometimes archive manager CAN'T extract generated zip archive file. please use unzip command to extract that !!

This is a command line tool to generate png file which hides a zip file in its zTXT chunk.

ZIP will be hidden in PNG as zTXT chunk, and that PNG is still surely VALID.

On the other hand, PNG will be hidden in ZIP as extra data that is located in forehand section of that ZIP, and that ZIP is also still surely VALID.

dependencies

• Erlang/OTP > 18

run

$ chmod u+x ./*.erl
$ ./zipng.erl path/to/png path/to/file1 path/to/file2 ...
%% file1,2...will be zipped and appended to png

notifications

• Function Unused WARNINGS will be appeared when you run erlang script. Please ignore them.
• Huge file payload may cause unexpected error. Contents of ZIP file should be within 4.0MB.